diff --git a/ReFuel.Gltf/GltfDocument.cs b/ReFuel.Gltf/GltfDocument.cs
index 1be3147..bbc0a46 100755
--- a/ReFuel.Gltf/GltfDocument.cs
+++ b/ReFuel.Gltf/GltfDocument.cs
@@ -189,7 +189,7 @@ namespace ReFuel.Gltf
                     }
                     else
                     {
-                        str.Seek(0, SeekOrigin.Begin);
+                        wrapper.Seek(0, SeekOrigin.Begin);
                         return OpenJson(wrapper);
                     }
             }